Grading machine for granular material



uly 8 1924. 1,500,850

D. B. RUSH GRADING MAcnINg FOR GRANULAR MATERIAL Filed Jan. 9, 1924 5 InVerzZof Patented July 8, 1924,

uireo STATES PATENT oFrlcs Y DONALD B, RUSH, OF VILLA PAR-K, ILLINOIS, ASSIGNOB TO ROBERT W,

COMPANY, A CORPORATION OF DELAWARE.

GRADING MACHINE FOR GRANULAB;

T'ocll whom it may concern:

Beiit known that I, DONALDBQ RUSH, a citizen, of the. United States, residing at Villa Park, county oi Du Page, State of Illinois, have invented a certain new and useful Improvement in Grading Machines for Granular Material, and declare the fol lowing tobe a full, clear, and exact description of the same, such as will enable others skilled in the art, to which it pertains to make, and use, the same, reference beinghad to the accompanying drawing, which forms a part of this, specification. v

,The present invention has for its object to. produce a simple and novel machine for quickly and effectively sifting comminuted solids, particularly those that are in afinely, divided or powdered state, fo I the purpose of grading the same. I e

- The various features of novelty whereby my inventionv is characterized will hereinafter he pointed out with particularity in the claims; butfor a full understanding of my invention and of its objects and advantages, reference maybe had to the following detailed description takenin connection with the. accompanying drawing, wherein Eignre 1 is a perspective view of a machine arranged in accordance with a preferredi form of my invention, employing 0111 pansor sieves, two. of which are omitted fl'OIlLthe drawing; Fig. 2 isa vertical transerse section hrbi v h h l h F 3 is. ertical sect ce; 0 sdmevhat larger scale, taken "atright anglesto'theplane of i Z' IT IQ gh. qn Q f h pp n edgesacflth mac ne; a 44 s a p plan view of one, corner of the machine; showing one. ofthe pans or sieves I The sitting or gradingisjdone in cylindrical pans or receptacles 1, each of which has a removablefscren 2, extending transversely across the same betweenthe top' and bottom. These devices are in'commonuse and may therefore be said tolbe of any usual or. suitable construction; In grading very finely divided material such as ordinary dry; powdered cement, for example, the screen must'be very fine, having a mesh of perhaps two hundred to the inch. In order to ina'ke this very fine material pass through the screen,,th e pan must bejarred and shaken, this being a tedious operation when nei iimfedf'bi Application filed January 9, 1924. 7 Serial No. 685,153.

taneously jarred and shaken by poweractuated mechanism and, at the same time,

the material on the screens from piling up in a heap first'on one side and then on the" other side ofeach pan; i

Any desired number of pans, are set" loosely in recesses or pockets 3-opening out of the top of a suitable table 4,. but extendlng' only part way through the table. The pans are cylindrical and" the recesses or" pockets are also preferably made cylindrical but somewhat larger in diameter than the pans, so that the pans may move about in the pockets or recesses.

The pockets or recesses are lined with a suitable cushioning material 5, this lining extending around the sides and also, if de sired, across the bottom of each pocket. It will thus be seen that if the table is rapidly oscillated in the direction of its length or width, the pans will be shaken and jarred, due to the fact that they continuethei-r movements until arrested by bumping against the sides of the pockets, whenever the table reaches either end of a stroke and stops before starting on a return stroke. The table is supported'upon the open top of a boX or casing 6 and'thus forms a cover for th'e casi ng} The table and the casing;

are given a rotary movement which prevents may both be" made u a so that the: I

table may conveniently be supported onrails 7 arranged along the-upper edges of two opposite sides of the-casing, by means; of suitable wheels 8 journalled on the table; The table therefore forms a carriage that maybe moved back and forth along the rails with the exertion of a minimum of effort. fVVithin the casing is arranged a small motor 9 provided with a flexible shaft 10 on which is fixed; a worm 11 that meshes with a worm wheel12 fixed to a suitable shaft 13 that is'in turn rotatably mounted insuit-able bearings. There is also fixed to the shaft 13a crank or disk 14. A bracket 15 is fixedto and projects down from the under side of the table; and between the bracket and the disk or crankis a connecting'rod 16. The parts areso arranged that the connecting rod operates in a vertical plane parallel with the rails or tracks on which thetable is supported so that, when a high speed and therefore, in order to keep the same, and also the gearing, reasonably cool, the side Walls of the casing are provided with openings 17 near thebase'ofthe casing, andthe motorshaft is provided with a fan element 18, so that a constant stream of air iscaused to flow through the casing while the motor is'running, and the mechanism isthus prevented fromoverheating.

The'reciprocation and jarring of the pans that result'from the operation of the table are not sufficient to produce the bestresults. becausethe material in each pan tends to pile up'first on one side and then on the other as the pan moves back and forth. It a. pan be rotated at the same time that it is shaken back and forth, all parts fOf the screen therein come into play and the shifting'of the contents becomes more rapid and effective. In order to secure the necessary rotarymovement of the pans, without employing any complicated mechanism or at-- tachments, and without making it necessary to fasten the pan to anything, I have made use of the simple expedient of tw small buttons-19 and 20 projecting inwardly from the sides of each pocket or recess in the table. These buttons or projections are preferably placed diametrically opposite each other, on opposite sides of a vertical plane passing through the center of the pocket or recess and parallel with the supporting tracks or rails for the table; the diameter connectingsaid buttons or projections makmg an acute angle wlth said plane; and the distance between the buttons or projections being considerably ter'of the pan.

Assuming the table to be reciprocated in greater than the diame the direction of the double arrow A in Fig.

.. 4, it will beseen that as the pan strikes the button 19, the pan will be turned in the counter-clockwise direction through more or-less f an angle. This occursduringa stroke of the table in one direction. During the next stroke, in the opposite direction, thepan strikes the button 20 and is thus given a further angular -movement in the same directionas before. The result is that each pan isturned step by step while it is beingreciprocated in the manner heretoforedescribed.' i 4 r 1 The buttonsor projections for turning the pans'orsieves are. preferably made of rubher or other cushioning material so as to eliminate noise and also to enable them to grip the pans more or less when they come forcibly into contact with the latter.

It will thus be seen that I have produced a siniple and 'novel mechanism by which a simple and novel operating mechanism for the table that carries the pans and sieves. normallyenclosed in a housing but rendered accessible for inspection or repairs by the mere act of swinging thetable up without disconnecting it from the operating mechanism.

While I have illustrated and described with particularity only a single preferred form of my invention, I do not desire to be limited to the exact structural details thus illustrated and described; but intend to cover all forms and arrangements which come within the terms employed in the definitions of my invention constituting the appended claims.

I claim: 7

l. Amachine of the character described comprising a support, a circular sieve resting loosely on said support, means for limiting the movement of the sieve relative to said support, means for reciprocating said support, and stops on said support in front of and behind the sieve and spaced apart adistance greater than the diameter of-the sieve, said'stops being arranged on opposite sidesof a line passing through the center of the sieve in the direction of reciprocation, whereby the sieve will be given a step-bystep 'rotarymovement as well asca shaking or jarring when said support is reciprocated,

2. A mach'ne of the character described comprising a casing'open at the top, a table extending across'the top of the casing and supported by the latter for reciprocatory movements in the plane thereof. a circular sie'veresting loosely on said table, means for limiting the movements of the sieve across the table. mechanism in the casing forreciprocating said table, and stops so positioned on; the tablethat the sieve-will strike ing sieve, the projections in the several pockets or recesses being similarly positioned.

4. A machine of the character described comprising a casing open at the top, a table resting loosely upon and supported by said casing, sifting means carried by the table, power mechanism including a crank member arranged in said casing, and a connecting rod extending between said crank member and said table to reciprocate the latter, the parts being so proportioned and arranged that the table may be liftedfrom the casing to expose said power mechanism Without unfastening the connecting rod.

5. A machine of the character described comprising a casing, a table resting on said casing and movable across the top of the same, sifting means including a receptacle for containing the sifted material carried by said table, a motor within said casing, a crank member in the casing and a connecting rod between the same and said table, and a speed-reducing gearing including a flexible resilient shaft between said motor and said crank member.

6. A machine of the character described comprising a casing, a table resting on said casing and movable across the top of the same, sifting means carried by said tab-1e, a motor within said casing, a crank member in r the casing and a connecting rod between the same and said table, a speed-reducing gearing including a flexible resilient shaft between said motor and said crank member, a fan on said motor shaft. and there being openings through the sides of the casing to permit the fan to cause a current of air to flow through the casing when the motor is running.

7. A machine of the character described comprising a casing, a table resting on said means carried by said table, power mechanism in the casing for reciprocating said table, a fan associated with said power mechanism, and there being openings through the walls of the casing to permit the fan to cause a current of air to flow through the casing while said power mechanism is in operation.

8. A machine of the character described comprising a casing open at the top, parallel rails on the casing, a table overlying the top of the casing and having wheels resting on said rails, saidtable having a series of pockets extending partly through the same from the upper face, circular sieves considerably smaller in diameter than the pockets resting loosely in the latter, power mechanism in said casing for moving said table back and forth along said rails, and means in said pockets for engaging with said sieves and turning them step by step as the table is reciprocated.

In testimony whereof, I sign this specification.

DONALD B. RUsHf casing and movable across the same, sifting 

